Lifting-clamp



w. MpHENcH.

LIFTING CLAMP.

. APPcAToN num APR.24, sa.

1,369,807. Bama Man 1,1921..

. INVENTR F My v v l Arm/Laffy tas 'unTEjp STATES 'PA'TEn-'r opics'.

.. wunm m. mcrci, or mr azman. new

tm'rmwmmr. 1

ect'netal 4dates uf slahs such as are vused inhship yari s, hailer works and :Min-tutal jetsnf the invention is to `ii-ii:'ide alifting grip. ,A'n'thee object ni tu cnnit'ne; the the jaws will exei-t an -ulm'ard gripping action ini the \'gn:k.`heing lifted. ,1\;'.fu'l.he'` ohji-mt. is tn construct a clanp 'whieh iS lighter in weight and at. the same tine vnuler 'tu 'epi-rate than the ylanps in L nn n n liso.l .-\'sl.ill Ini-ther object4 is to lirnvidc a -lnnp synncti'ically c h nq'ncted ni duplicate payts not requiring:"rghts and the fnllmving di-a-riltnna'ml,the aplwlnled claims.

. ln. the drawing illnstting nna enlndi-v 4 Fig. 2 iS 'swtiunal plan' taken ventrally ni Fig. l and'i'iewvd frm the, right..

Ijleeetufre lifting vlanps nl' this general character have lwen made ni' .lezwy fin-gings lnvin'if (me lixed jaw and ;me pitutvd ed with :n uln'u-diy extending arm connected h y vai-imus link ul' lugghs n(-.,'lani:-'.nS u the. tai-Ide nl' tin,- huh-:ting means. The ahihi-.tian t/: this funst'n-tinn isthnt. heavy (urging-s are Hundred t give the parts sdlivienl'. strenglh. the sln-.u'ing Stress uf' the entire weight. is sustained ly one pivit. pin ni the singh-. -lnp jaw and thn gripping: :nitinn nl' thi` mui-:dde jaw is downward which causes the vlanp to :din nn the work when li'st: takin;r hold.

With the inp'm'el dmhle grip fhmp herein shown (hn ahmm uhjcntinns a'- nvercnne and a lighter and safer rhmp is |'iduN-d. The vlanip ('-'i. t:-' ef dnplieatn nln-el; plates il and 4 vanl having twn lfwnhardly extending ears and l' l-rning venlral v'flt'f'ln-s i' :ndH it wlivh thel work being: lifted may extend. I

spwmnon oi mim ramn; 3 'i ftu hold itin place.,

rate'te Mar. 1, 1921.

r jan'sIUandIl are f ,uxthed .besses 12 iii- Q Lanao? form the crotch described with a closedtop and bring the pivot pins 16 and 17 down below the upper edge of the plato to be lfted and approximately in line withthe clam ing jaws and the latter are cam-shaped on t er inner faces so that they exert a ve'iy powerful pinching efl`ect on the work. he operating arms 14 and 15 which operate the aws extend =uplward and across the plane o the plate so t at the cam-shaped jaws are moved nward and upward with respect to their ivots when the clam is lifted,, It is this eature which makes t e clamp arti'cularly safe against slipping as the tac e is raised and gradually lifts the' operating arms 14. and 15 to the final clampn 'postion.

The armswl and 15l exten of the crotch and are limited in their downward movement by strikin'nthe hubs of the op osite clamping jaws. hat is, the arm 14 strikes the hub or boss 13 of the opposite jaw dnd the arm 15 strikes the hubor boss 12; and when the arms rest on these besses they extend slightly above the closed top of the crotch. T is facilitabes the iquick relense of a plate after it has been trans prted by the clamp and lowered to the esired position. If the arms were in position to be struck by the top of the plate when the clamp is first dropped on the same this operation would cause the arms to be ressed .up by the plate and the clnmping jaws to bite into the same before any tension is put on the lifting tackle, and would subse quently prevent the lowering of lthe arms to a point where the jaws would entirely free the plate. With the arrangement shown the clamp will drop freely onto the plate and the jaws Will not b ite into the latter unr til the tackle is lifted, and when the plate is to be released there is abundant room for lowering the arms suflicientl to entirely withdraw the jaws from the ate.

VVhile I have described wit i great particularity of detail certain embodiments of my invention, yet it is not to be understood therefrom that the invention is restricted -to the particular embodinents disclosed. Various other modifications in detail or in the arrangement of the parts may be made by across the top i v.and pivoted to the free ends of sa' shaped arms, said arms M and 15 being supthose skilled in the art without departing from the invention as defined in the followi claims.

hat I claim iaz-ri 1. A liftin clamp includintg a cheek member having dpendng arms ormin a deep narrow crotch between them into w ich the work is introduced, clamp arms having toothed grippin jaws formed thereon extendin across' t e topof said crotch and pivote below the top of said crotch to the depending arms of saidicheelr members so that an upward motion of the clamp arms will cause an inw'a'rd and upward movement of the gripping jaws, and links each 4 connected at one-end ,t'o a free end of .one of said clamp-arms 'and at thev other e nd to an ovcrhead pin, said cheek member being supportedentirel from said clamp-arms and the latter bein su ported entirely from said links, so t at te entire clamp hangs freely from a supporting tackle engaging said overhead pin and when lowered on the work causes the Work to hold up Vthe jaws and the cheek member and thus to cause the Vopening of the l'jaws.

2. A lifting c amp including cheek plates 3 and 4 having depending arms forming 'a crotch into which the work eir'tends,I hook shaped arms 14 and 15 extending across the top of said crotch andhaving toothed gripi ping jaws formed thereon, lnks 20 and 21 connected overhead by' a sustaining'nn 22 hook ported'entirely from said links 20 and 21 so that the lowering of the jaws on the work tends to hold up the arms 14 and 15 and consequently the cheek plates and thus to open the grippin jaws when the clamp is lowered on the worn the parts being so arranged that the suspension members will act when supporting a loadto ive an upward movement to the armsv 14. an 15, and an in- -ward and upward movement to said gripping jaws soas to exert an upward'clampmg pressure on the work.

n witness whe-roof I have hereunto signed my name. 4-. i

` WILLIAM M. HENCH. 

